/* roulang page: index */
:root {
      --primary-dark: #0f172a;
      --primary-steel: #1e293b;
      --brand-blue: #0284c7;
      --brand-blue-hover: #0369a1;
      --accent-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --bg-light: #f8fafc;
      --bg-alt: #f1f5f9;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --border-dark: #334155;
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
      --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
      --shadow-lg: 0 10px 24px rgba(15, 23, 42, 0.12);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部双行导航系统 */
    .top-bar {
      background-color: #0b1120;
      color: #94a3b8;
      font-size: 0.8125rem;
      border-bottom: 1px solid #1e293b;
      padding: 7px 0;
    }

    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    .top-bar-contact {
      display: flex;
      gap: 20px;
      align-items: center;
    }

    .top-bar-contact span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .top-bar-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 6px #10b981;
      display: inline-block;
    }

    .header-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .brand-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--brand-blue), #0b1120);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-weight: 800;
      font-size: 1.1rem;
      box-shadow: 0 2px 8px rgba(2, 132, 199, 0.35);
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.02em;
    }

    .brand-tag {
      font-size: 0.7rem;
      background: #e0f2fe;
      color: var(--brand-blue);
      padding: 2px 6px;
      border-radius: 4px;
      font-weight: 600;
      margin-left: 4px;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }

    .nav-link {
      font-size: 0.9375rem;
      font-weight: 600;
      color: var(--primary-steel);
      position: relative;
      padding: 6px 0;
    }

    .nav-link:hover, .nav-link:focus-visible {
      color: var(--brand-blue);
    }

    .nav-link::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background-color: var(--brand-blue);
      transition: var(--transition);
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 20px;
      border-radius: var(--radius-md);
      font-size: 0.875rem;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--brand-blue);
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.3);
    }

    .btn-primary:hover, .btn-primary:focus-visible {
      background-color: var(--brand-blue-hover);
      box-shadow: 0 4px 12px rgba(2, 132, 199, 0.45);
      transform: translateY(-1px);
    }

    .btn-primary:active {
      transform: translateY(0);
    }

    .btn-secondary {
      background-color: #ffffff;
      color: var(--primary-steel);
      border-color: var(--border-color);
    }

    .btn-secondary:hover {
      background-color: var(--bg-alt);
      border-color: #cbd5e1;
    }

    .btn-dark {
      background-color: #1e293b;
      color: #ffffff;
      border-color: #334155;
    }

    .btn-dark:hover {
      background-color: #0f172a;
      border-color: #475569;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 8px;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    /* 板块通用布局样式 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-light {
      background-color: #ffffff;
    }

    .section-slate {
      background-color: var(--bg-light);
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-dark {
      background-color: #0b1120;
      color: #f8fafc;
    }

    .section-header {
      margin-bottom: 48px;
    }

    .section-header.text-center {
      text-align: center;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .section-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      padding: 4px 12px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      background-color: #e0f2fe;
      color: var(--brand-blue);
      border: 1px solid #bae6fd;
    }

    .section-dark .section-badge {
      background-color: rgba(6, 182, 212, 0.15);
      color: var(--accent-cyan);
      border-color: rgba(6, 182, 212, 0.3);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.02em;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .section-dark .section-title {
      color: #ffffff;
    }

    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .section-dark .section-desc {
      color: #94a3b8;
    }

    /* 1. 首屏 HERO 板块 */
    .hero-section {
      padding: 70px 0 90px;
      background: radial-gradient(circle at top right, rgba(2, 132, 199, 0.08), transparent 50%),
                  radial-gradient(circle at bottom left, rgba(6, 182, 212, 0.06), transparent 50%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.22;
      color: var(--primary-dark);
      letter-spacing: -0.03em;
      margin-bottom: 20px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, var(--brand-blue), #0369a1);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-intro {
      font-size: 1.125rem;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 32px;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-bottom: 36px;
    }

    .hero-tag-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background-color: var(--bg-alt);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--primary-steel);
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 28px;
    }

    .hero-stage {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      background-color: #0b1120;
    }

    .hero-stage-img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      display: block;
      opacity: 0.92;
    }

    .stage-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 20px;
      background: linear-gradient(to top, rgba(11, 17, 32, 0.95), rgba(11, 17, 32, 0.4), transparent);
      color: #ffffff;
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
    }

    .stage-metric {
      font-size: 0.8125rem;
      color: #94a3b8;
    }

    .stage-val {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--accent-cyan);
      font-family: monospace;
    }

    /* 2. 技术底座与品牌工程标准 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .about-visual {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .about-visual img {
      width: 100%;
      height: 360px;
      object-fit: cover;
    }

    .about-spec-box {
      background-color: var(--bg-alt);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 24px;
    }

    .spec-row {
      display: flex;
      justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px dashed var(--border-color);
      font-size: 0.875rem;
    }

    .spec-row:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }

    .spec-key {
      color: var(--text-muted);
      font-weight: 500;
    }

    .spec-val {
      color: var(--primary-dark);
      font-weight: 700;
      font-family: monospace;
    }

    /* 3. 核心优势矩阵 6宫格 */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .matrix-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }

    .matrix-card:hover {
      border-color: var(--brand-blue);
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .matrix-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: #e0f2fe;
      color: var(--brand-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 20px;
    }

    .matrix-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 12px;
    }

    .matrix-text {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
    }

    .matrix-tag {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--brand-blue);
      background-color: var(--bg-alt);
      padding: 3px 8px;
      border-radius: 4px;
      display: inline-block;
    }

    /* 4. 热门汽车软件工具产品矩阵 3列 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .product-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .product-card:hover {
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
      transform: translateY(-3px);
    }

    .product-header-img {
      height: 200px;
      width: 100%;
      object-fit: cover;
      position: relative;
    }

    .product-body {
      padding: 28px 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .product-proto-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: #0369a1;
      background: #e0f2fe;
      padding: 3px 8px;
      border-radius: 4px;
      margin-bottom: 12px;
      align-self: flex-start;
    }

    .product-title {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 12px;
    }

    .product-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .product-spec-list {
      list-style: none;
      margin-bottom: 24px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
      flex: 1;
    }

    .product-spec-list li {
      font-size: 0.8125rem;
      color: var(--primary-steel);
      padding: 6px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .product-spec-list li::before {
      content: "✓";
      color: var(--brand-blue);
      font-weight: 800;
    }

    /* 5. 深色研发理念与架构闭环区 */
    .arch-flow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
      margin-top: 40px;
    }

    .arch-flow-card {
      background: rgba(30, 41, 59, 0.7);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
      transition: var(--transition);
    }

    .arch-flow-card:hover {
      background: rgba(30, 41, 59, 1);
      border-color: var(--accent-cyan);
      transform: translateY(-2px);
    }

    .flow-step-num {
      font-size: 1.5rem;
      font-weight: 900;
      color: var(--accent-cyan);
      opacity: 0.8;
      margin-bottom: 12px;
      font-family: monospace;
    }

    .flow-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 10px;
    }

    .flow-desc {
      font-size: 0.875rem;
      color: #94a3b8;
      line-height: 1.6;
    }

    /* 6. 行业应用场景 4步横向流程 */
    .solution-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 36px;
    }

    .solution-step {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .step-badge {
      display: inline-block;
      width: 28px;
      height: 28px;
      background-color: var(--brand-blue);
      color: #ffffff;
      font-size: 0.875rem;
      font-weight: 700;
      line-height: 28px;
      text-align: center;
      border-radius: 50%;
      margin-bottom: 14px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 10px;
    }

    .step-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 7. 用户案例墙与车企实测 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .case-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .case-img {
      height: 240px;
      width: 100%;
      object-fit: cover;
    }

    .case-content {
      padding: 28px 24px;
      flex: 1;
    }

    .case-client {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--brand-blue);
      text-transform: uppercase;
      margin-bottom: 8px;
    }

    .case-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 12px;
    }

    .case-p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
    }

    .case-stats {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }

    .case-stat-num {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary-dark);
      font-family: monospace;
    }

    .case-stat-lbl {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 8. 关键技术运行数据指标条 */
    .metrics-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-box {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .metric-number {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--brand-blue);
      font-family: monospace;
      line-height: 1.1;
      margin-bottom: 8px;
    }

    .metric-label {
      font-size: 1rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 6px;
    }

    .metric-sub {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 9. 开发者与测试工程师评价 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-stars {
      color: var(--accent-amber);
      font-size: 1rem;
      margin-bottom: 12px;
    }

    .review-quote {
      font-size: 0.9375rem;
      color: var(--primary-steel);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }

    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e2e8f0;
      color: var(--brand-blue);
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.875rem;
    }

    .author-name {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--primary-dark);
    }

    .author-role {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 10. 内嵌技术动态资讯列表 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .news-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .news-card:hover {
      border-color: var(--brand-blue);
      box-shadow: var(--shadow-sm);
    }

    .news-version-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--brand-blue);
      background-color: #e0f2fe;
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
      margin-bottom: 14px;
    }

    .news-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .news-summary {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex: 1;
      margin-bottom: 16px;
    }

    .news-date {
      font-size: 0.75rem;
      color: #94a3b8;
    }

    /* 11. FAQ 手风琴面板 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item:hover {
      border-color: #cbd5e1;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      background: none;
      border: none;
      font-size: 1.0625rem;
      font-weight: 700;
      color: var(--primary-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
    }

    .faq-icon {
      font-size: 1.25rem;
      color: var(--brand-blue);
      transition: transform 0.25s ease;
      font-weight: 400;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background-color: #f8fafc;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 260px;
      padding: 16px 24px 24px;
      border-top: 1px solid #f1f5f9;
    }

    .faq-answer p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 12. 终极部署转化与支持要约 */
    .cta-container {
      background: linear-gradient(135deg, #0f172a, #1e293b);
      border-radius: var(--radius-lg);
      border: 1px solid #334155;
      padding: 56px 48px;
      color: #ffffff;
      box-shadow: var(--shadow-lg);
    }

    .cta-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }

    .cta-title {
      font-size: 2rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
      color: #ffffff;
    }

    .cta-p {
      font-size: 1rem;
      color: #94a3b8;
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .cta-specs-pill {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-bottom: 28px;
    }

    .pill-item {
      font-size: 0.75rem;
      font-weight: 600;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      color: #cbd5e1;
    }

    .cta-form {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--shadow-md);
      color: var(--primary-dark);
    }

    .form-title {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .form-desc {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 20px;
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-label {
      display: block;
      font-size: 0.8125rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--primary-steel);
    }

    .form-input, .form-select {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      outline: none;
      transition: var(--transition);
      background: #ffffff;
    }

    .form-input:focus, .form-select:focus {
      border-color: var(--brand-blue);
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    }

    .form-submit-btn {
      width: 100%;
      padding: 12px;
      background-color: var(--brand-blue);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 0.9375rem;
      cursor: pointer;
      transition: var(--transition);
    }

    .form-submit-btn:hover {
      background-color: var(--brand-blue-hover);
    }

    /* 页脚系统 */
    .site-footer {
      background-color: #0b1120;
      color: #94a3b8;
      padding: 64px 0 28px;
      border-top: 1px solid #1e293b;
      font-size: 0.875rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 14px;
    }

    .footer-brand-desc {
      font-size: 0.875rem;
      color: #64748b;
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .footer-h4 {
      font-size: 0.9375rem;
      font-weight: 700;
      color: #f8fafc;
      margin-bottom: 16px;
      letter-spacing: 0.02em;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94a3b8;
    }

    .footer-links a:hover {
      color: var(--accent-cyan);
    }

    .footer-bottom {
      padding-top: 28px;
      border-top: 1px solid #1e293b;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
      color: #64748b;
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid, .about-grid, .cta-grid {
        grid-template-columns: 1fr;
      }
      .matrix-grid, .products-grid, .reviews-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .arch-flow-grid, .solution-timeline, .metrics-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .matrix-grid, .products-grid, .cases-grid, .metrics-row, .reviews-grid, .news-grid, .arch-flow-grid, .solution-timeline {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.65rem;
      }
      .cta-container {
        padding: 32px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }